Hi, I started up my MacBook this night and got the typical bong but then the apple symbol, file folder with ? on it and a no entry sign started flicking through in rapid succession. I have read as many forum pages as I could to try and find out what the problem is and it looks like its kernal issues but i dont know what that means. I did cmd v and got the following error message efiboot loaded from device: Acpi (PNP0A03,0)/Pci (1FI2)/SATA(0,0)/HD(Part2,Sig551B82C4-2BC8-4077-80E0-4AA25648B060) boot file path: \System\Library\CoreServices\boot.efi .Loading kernel cache file System\Library\Caches\com.apple.kernelcaches\kernelcache.E312DF81 Loading mach_kernel... Could not open file mach_kernel Error loading kernel mach_kernel (0xe) I have no installation discs and Safe boot isn't working. Please I am so stressed out !!!!